Tortle portals form a teleport system between the islands, which are designated as the fort (first island), the divine energy merchant (second island), and the divination colony (third island). The portals require level 90 Divination to activate, and 50 ancestral energies.
The message in a bottle to find the island of Quis-land is on the third island, on the western beach underneath the south-western rocks. Only the tip of the bottle can be seen under the rocks, looking from the beach side.
The Islands That Once Were Turtles are three largely uninhabited islands in The Arc. Legend says they were once giant turtles that were somehow turned to stone.
In the voyage First Contact, the player may make contact with a well connected trader on a ship docked north of the Islands That Once Were Turtles.
In High Spirits, the player may be called upon to explore the forest covering the Islands That Once Were Turtles in search of resources. They are told to beware the old spirits that are said to haunt it.
In A Friend Indeed, the player may befriend an influential trader who operates from the Islands That Once Were Turtles.
In X Marks the Spot, a useful contact may find rich resources on the Islands That Once Were Turtles.
Faux "islands" which are actually on the backs of giant turtles are a cross-cultural archetype, dating back to the Mayans, the Greeks, and Native American mythology. More recently, The Legend of Zelda: Majora's Mask included a Giant Turtle that looks like an island.
When charging the Tortle Portal the game chat says "Reticulating shrines", a reference to the loading screens of The Sims game series which say "reticulating splines".
The examine text of the watch towers off the coast of the first island are references to the Jimi Hendrix song All Along the Watchtower.